However, the best Chromium-based browser IMO is Vivaldi, and you can enable multiple tab rows on that, as you can for Firefox via various instructions, none of which are official options.
I found that The Patcher works well (though FF updates sometimes broke it, thus needing an update) for MTRs'.

However, Floorp (written by Japanese students) enables this as a feature (preferences>design). See review here.
And with Floorp, I found you can run multiple installations of it (which you can with portable Firefox with a little editing, as I do, each generally for its own purpose). Thank God for such options.
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By the grace of God, I have 128GB RAM on a MSI b450 Pro mobo (+ RYzen 3200G) which easily runs two Bible programs, 2 word pros and multiple docs, 8 portable installs of FF, 2 of Vivladi, 2 of Floorp, browsers each for its own general purpose) all with multiple tab rows. Thanks be to God. May all be used only for what is good in His sight.

Nice!

Thanks to daniel1212 for the ping!